RipTiger is a good application to download video files from video-sharing websites. With this software, you are going to be able to download any video from the most popular video-sharing websites. Once you have downloaded a video file, you will not have to be on-line in order to play it.
As you might know, the video files you download from most of the video-sharing websites are FLV files. That means you will not be able to play them unless you have a FLV player or a video conversion tool. That is not entirely true though. If you download the files with this software, you will be able to convert them and watch in almost every media player without any extra applications. You won't need any conversion tool or FLV player installed on your computer. RipTiger will let you download and convert the files to many output formats, so that you can play your favorite files on your computer anytime you want. Plus, the software supports some formats that are compatible with iPods and mobile devices, so you will be able to extract them as well.